Defining Functions

Functions in C allow you to encapsulate a block of code, making the code modular and promoting reusability. Let's explore how to define and use functions in C.

Function Definition

A function in C is defined using the following syntax:

return_type function_name(parameters) {
    // Function body
    // Code to be executed
    return value; // Optional return statement
}

• return_type: The type of the value the function returns. It can be void if the function doesn't return a value.

• function_name: The name of the function.

• parameters: The input parameters that the function takes (if any).

• return value: The value the function returns (if applicable).

Here's an example of a simple function:

#include <stdio.h>

// Function definition
void greet() {
    printf("Hello, world!\n");
}

int main() {
    // Function call
    greet();
    return 0;
}

In this example, the greet function is defined with a void return type, meaning it doesn't return any value. It prints "Hello, world!" when called from the main function.